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检索条件"机构=Applied Image and Signal Processing Research Group"

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Orthogonal basis expansion based atrial activity reconstruction for atrial fibrillation electrocardiogram analysis

Orthogonal basis expansion based atrial activity reconstruct...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Sandun Kodituwakku Thushara D. Abhayapala Rodney A. Kennedy Applied Signal Processing Group Research School of Information Sciences and Engineering Australian National University Canberra ACT Australia

We propose a novel algorithm for extracting atrial activity from single lead electrocardiogram (ECG) signal sustained with atrial fibrillation (AF), based on a short-time expansion of an orthogonal basis function set. The method preserves the time variation of spectral content of the underlying AF signal, thus time-frequency analysis of the AF signal can be successfully performed. The new method is compared to the standard average beat subtraction (ABS) method using synthetic AF sustained ECG data. The orthogonal basis expansion method has a higher correlation with the original AF signal compared to the ABS method for a range of signal to noise ratio (SNR) levels, and correlation is improved by 16% at an SNR of 0dB. Time-frequency analysis of the reconstructed AF signal based on Bessel distribution also shows the superiority of the orthogonal basis expansion method over ABS.

关键词： Atrial fibrillation Electrocardiography Time frequency analysis signal to noise ratio Morphology signal processing Electrodes USA Councils signal analysis Algorithm design and analysis

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Second-Order Statistics of 2D Non Isotropic Mobile-to-Mobile Wireless Channels

Second-Order Statistics of 2D Non Isotropic Mobile-to-Mobile...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Prasad T. Samarasinghe Thushara D. Abhayapala Tharaka A. Lamahewa Rodney A. Kennedy Applied Signal Processing Group Research School of Engineering ANU College of Engineering and Computer Science The Australian National University

ISBN: (纸本)9781457713460

This paper derives closed form expressions for second order statistics of mobile-to-mobile wireless channels in non isotropic environments. Specifically, we consider Rice, Rayleigh and Nakagami fading channels in four different non isotropic scattering environments with Angle of Departure (AoD) and Angle of Arrival (AoA) distributions given by (i) separable Truncated Gaussian, (ii) separable von-Mises, (iii) Truncated Gaussian bivariate and (iv) Truncated Laplacian bivariate distributions. We have shown that the second order statistics, namely, the Level Crossing Rate (LCR) and the Average Fade Duration (AFD) in different fading channels can be expressed in terms of known scattering coefficients of the above angle of departure and arrival distributions. We have illustrated the usefulness of the results by plotting LCR and AFD against the channel correlation for various scattering scenarios.

关键词： angles of departure Fading channels wireless channels Higher order statistics Angle Isotropic Vincristine Separable non Bivariate

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Application of charge-coupled devices to multiple-bit-upset analysis in radiation environments

Application of charge-coupled devices to multiple-bit-upset ...

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European Conference on Radiation and its Effects on Components and Systems (RADECS)

作者： S.P. Platt Z. Torok A.M. Chugg M.J. Moutrie A.J. Burnell Applied Digital Signal and Image Processing Centre University of Central Lancashire Lancashire UK Radiation Effects Group MBDA UK Ltd. Bristol UK

High-resolution images of neutron-induced transient upsets in charge-coupled devices (CCDs) are analysed as an analogue of single-event upsets (SEEs) in memory devices. In particular, we investigate the relationship between the mean and variance of the event size distribution in the CCD images. Over the range of upset thresholds of practical interest a consistent form for this relationship is observed across different CCD types and resolutions and is found to be similar for SEE-inducing neutron beams with different energy spectra. This information is applied to a technique for inferring the statistics of multiple bit upsets (MBUs) from data sets derived from accelerated testing of memory devices. The technique is used successfully to infer the statistics of MBUs in a synchronous DRAM, without recourse to a physical bit map.

关键词： Single event upset Charge coupled devices Statistics Neutrons image analysis Particle beams Life estimation Testing Statistical distributions Transient analysis

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Fast Node Selection of Networked Radar Based on Transfer Reinforcement Learning 5th

Fast Node Selection of Networked Radar Based on Transfer R...

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5th IFIP TC 12 International Conference on Intelligence Science, ICIS 2022

作者： Cao, Yanjun Wang, Yuan Guo, Jingjing Han, Li Zhang, Chao Zhu, Jin Zhang, Tianyang Zhang, Xiangrong The 54th Research Institute of China Electronics Technology Group Corporation Beijing China Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education Xidian University Shaanxi Xian710071 China National Laboratory of Radar Signal Processing Xidian University Xian710071 China

ISBN: (纸本)9783031149023

The networked radar system can synthesize different echo signals received by various radars and realize the cooperative detection of multiple radars, becoming more and more critical for data fusion sharing and network collaboration. However, due to the large number and wide range of nodes in the networked radar system, there exists a redundancy problem in radar node assignment, which causes additional resource consumption and slows down the task execution speed of radar node selection. To solve the above problem, this paper proposes a fast radar node selection method based on transfer reinforcement learning to quickly select the optimal and minimum node resources. The proposed method devises a novel reward function for the Monte Carlo Tree and a different termination state of iteration to select the minimize the number of radar nodes. In order to further accelerate the selection of radar nodes, transfer reinforcement learning is presented to fully leverage the previous knowledge. Experimental results show that our proposed method can quickly select the optimal and minimum radar nodes in a brief period, significantly improving the speed of radar node selection in the networked radar. © 2022, IFIP International Federation for Information processing.

关键词： Reinforcement learning

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On the performance of warping-based motion estimation

On the performance of warping-based motion estimation

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2003 10th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2003

作者： Al-Mualla, Mohammed E. Canagarajah, C. Nishan Bull, David R. Multimedia Communication and Signal Processing Group Etisalat College of Engineering Emirates Telecommunications Corporation P. O. Box: 980 Sharjah United Arab Emirates Image Communications Group Centre for Communications Research University of Bristol MV Building Woodland Road BristolBS8 1UB United Kingdom

ISBN: (纸本)0780381637

Warping-based motion estimation has been proposed in the literature to achieve higher video coding efficiency compared to conventional block-based motion estimation. This paper investigates the performance of warping-based methods at very low bit rates typical of mobile video communication applications. Simulation results show that despite their improvements over block-based methods, the use of warping-based methods in such applications may not be justifiable due to the huge increase in computational complexity. In fact, it is shown that similar, if not better, improvements can be obtained, at a fraction of the complexity, by simply augmenting basic block-based methods with techniques like subpel accuracy and overlapped motion compensation. © 2003 IEEE.

关键词： Motion estimation

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Vocal tract settings in speakers with obstructive sleep apnea syndrome 8

Vocal tract settings in speakers with obstructive sleep apne...

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8th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 2013

作者： Blanco, J.L. Schoentgen, J. Signal Processing Applications Group Universidad Politécnica de Madrid ETSI de Telecomunicación Avda. Complutense 30 Madrid28040 Spain National Fund for Scientific Research Belgium Laboratories of Images Signal Processing and Acoustics CP 165/51 Faculty of Applied Sciences Université Libre de Bruxelles 50 Av. F.D. Roosevelt BrusselsB-1050 Belgium

ISBN: (纸本)9788866554691

Automatic systems based on speech signal analysis for the early detection of obstructive sleep apnea (OSA) have achieved fairly high performance rates in recent years. However, a satisfactory explanation of these results has not been available. This presentation aims at explaining via an examination of the long-term spectra of OSA patients and normal control speakers these systems' ability to discover OSA speakers on the base of all-purpose cepstral coefficients. An interpretation of the longterm spectra in terms of the underlying tract settings suggests that the speech of OSA patients is characterized by a pharyngeal narrowing that may be captured by acoustic cues of the spectral contour of windowed speech frames. A novel interpretation of long-term spectra in terms of the first principal component of the temporal sequence of short-term amplitude-spectra is also discussed. © 2013 Firenze University Press.

关键词： Spectrum analysis

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Quality assessment of synthetic aperture sonar images

Quality assessment of synthetic aperture sonar images

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OCEANS - Europe

作者： Christian Debes Robert Engel Abdelhak M. Zoubir Arne Kraft Signal Processing Group Technische Universität Darmstadt Darmstadt Germany Applied Research Atlas Elektronik GmbH Bremen Germany

We consider the problem of navigation error detection in synthetic aperture sonar images. Specifically, the effect of errors in the position and attitude of the sonar antenna is explored in the image and frequency domain. We present two metrics which can be used to discriminate between images with different degrees of navigation errors. A systematic test is developed which allows an automatic detection of navigation errors. Simulated synthetic aperture sonar images are used to test the presented methods.

关键词： Quality assessment Synthetic aperture sonar Sonar navigation Layout Sonar measurements Automatic testing Aperture antennas Linear antenna arrays image reconstruction Sensor systems

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Generalization of supervised learning for binary mask estimation

Generalization of supervised learning for binary mask estima...

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International Workshop on Acoustic signal Enhancement (IWAENC)

作者： Tobias May Timo Gerkmann Technical University of Denmark Centre for Applied Hearing Research Lyngby Denmark Speech Signal Processing Group University of Oldenburg Germany

This paper addresses the problem of speech segregation by estimating the ideal binary mask (IBM) from noisy speech. Two methods will be compared, one supervised learning approach that incorporates a priori knowledge about the feature distribution observed during training. The second method solely relies on a frame-based speech presence probability (SPP) es-timation, and therefore, does not depend on the acoustic condition seen during training. We investigate the influence of mismatches between the acoustic conditions used for training and testing on the IBM estimation performance and discuss the advantages of both approaches.

关键词： Speech Noise Training Noise measurement Estimation Acoustics Testing

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Multizone 2D soundfield reproduction via spatial band stop filters

Multizone 2D soundfield reproduction via spatial band stop f...

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IEEE Workshop on Applications of signal processing to Audio and Acoustics

作者： Yan Jennifer Wu Thushara D. Abhayapala Applied Signal Processing Group Department of Information Engineering Research School of Information Sciences & Engineering Australian National University Australia

Any attempt to create multiple independent soundfields in separate zones over an extended region of open space results in unintended interference in a given zones from other zones. In this paper, we design spatial band stop filters to suppress interzone interference in the regions of interests and pass the desired soundfields with no distortion. This is achieved by using the higher order spatial harmonics of one zone to cancel the undesirable effects of the lower order harmonics of the same zone on the other zones. We illustrate the work by designing and simulating a 2D two-zone soundfield.

关键词： Power harmonic filters Loudspeakers Filtering Acoustic signal processing Acoustical engineering Band pass filters Interference suppression Audio systems Conferences Acoustic applications

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An implicit inter-subject shape driven image deformation model for prostate motion estimation

An implicit inter-subject shape driven image deformation mod...

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4th International Workshop on Computational and Clinical Applications in Abdominal Imaging, Held in Conjunction with the 15th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2012

作者： Papiez, Bartlomiej W. Matuszewski, Bogdan J. Shark, Lik-Kwan Moore, Christopher Applied Digital Signal and Image Processing Research Centre University of Central Lancashire Preston United Kingdom Christie Medical Physics and Engineering Christie NHS Foundation Trust Manchester United Kingdom Faculty of Medical and Human Sciences Manchester Academic Health Sciences Centre University of Manchester Manchester United Kingdom

ISBN: (纸本)9783642336119

This paper describes a novel approach for model based estimation of a dense deformation field utilizing an implicit representation of shape changes. Unlike existing methods based on the Point Distribution Model (PDM), the proposed method is not affected by an incorrect point correspondence which is a major limiting factor in practical applications of the PDM with clinical data. The proposed method uses regression between parametric representations of pelvic organs' shape and corresponding dense displacement field parameterized by the stationary vector field. The regression function is learned based on the training data sets including subjects with representative organ deformations, where the inter- and intra- subject correspondences are established via the log-Euclidean diffeomorphic formulation. The evaluation of the proposed method is conducted both on synthetic examples to provide systematic experimental evidence of correctness of the implicit shape representation for shape-driven prediction of the deformation field and, real MRI data to show accuracy in terms of deformation and prostate position prediction. The results show an increased robustness of the proposed framework in comparison to PDM approaches and suggest potential of its application for adaptive radiation therapy of prostate. © 2012 Springer-Verlag.

关键词： Deformation

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